Just to clarify a little what 10ClarionSt has said.
Your plea does not determine whether you are dealt with in the magistrates’ court or not. ABH is an “either way” offence and where you are ultimately dealt with depends on the seriousness of the offence.
You are currently in the magistrates’ court because all criminal prosecutions (from speeding to murder) begin their passage there. If you plead guilty the magistrates proceed to sentence and among their options is to commit the case to the Crown Court for sentence if they believe their powers of sentence (maximum six month’s immediate custody or suspended sentence) are insufficient.
If you pleaded not guilty the magistrates would hear the facts from the prosecution and they would decide whether to retain jurisdiction or commit the matter to the Crown Court for trial by judge and jury. If they retain jurisdiction you have the right to elect trial by jury (but note that you do not have the right to trial in the Magistrates’ court if they decline jurisdiction).
Magistrates’ sentencing guidelines determine whether the matter goes to Crown Court (either for trial or sentence). See page 11 of this document (which is the new guideline document to which exdc refers):
http://sentencingcoun...ine_-_Crown_Court.pdf